US 12,276,705 B2
Battery cell sampling voltage compensation method and apparatus and electric apparatus
Shaoyan Chen, Ningde (CN)
Assigned to CONTEMPORARY AMPEREX TECHNOLOGY (HONG KONG) LIMITED, Hong Kong (CN)
Filed by CONTEMPORARY AMPEREX TECHNOLOGY (HONG KONG) LIMITED, Hong Kong (CN)
Filed on Sep. 25, 2023, as Appl. No. 18/473,316.
Application 18/473,316 is a continuation of application No. PCT/CN2021/123018, filed on Oct. 11, 2021.
Prior Publication US 2024/0061052 A1, Feb. 22, 2024
Int. Cl. G01R 31/396 (2019.01); G01R 31/3835 (2019.01); H01M 10/44 (2006.01); H01M 10/48 (2006.01); H02J 7/00 (2006.01)
CPC G01R 31/396 (2019.01) [G01R 31/3835 (2019.01); H01M 10/441 (2013.01); H01M 10/482 (2013.01); H02J 7/0047 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A battery cell sampling voltage compensation method performed by a voltage sampling apparatus to measure a battery cell sampling voltage of a battery cell, wherein the voltage sampling apparatus is electrically connected to a battery pack connected in series, the battery pack comprises a plurality of modules connected in series, each module comprises a plurality of battery cells connected in series, at least one cross-module busbar electrically connects two different battery cells respectively belonging to two different modules in the battery pack and is located in a sampling channel of the voltage sampling apparatus, the sampling channel is formed between two sampling terminals of the voltage sampling apparatus, the two sampling terminals are electrically connected to two electrode terminals of one of the two battery cells connected to the cross-module busbar respectively, and the method comprises the following steps:
after confirming that all battery cells connected to the voltage sampling apparatus are in a normal state, charging or discharging the battery pack at a preset current to obtain sampling voltages of the plurality of battery cells using the voltage sampling apparatus;
determining, based on the obtained sampling voltages of the plurality of battery cells, the battery cell connected to the cross-module busbar and requiring sampling voltage compensation in the plurality of modules, and calculating an impedance voltage of the cross-module busbar; and
performing sampling voltage compensation on the battery cell requiring sampling voltage compensation based on the impedance voltage of the cross-module busbar.